diff mbox series

[net] veth: take into account peer device for NETDEV_XDP_ACT_NDO_XMIT xdp_features flag

Message ID 4f1ca6f6f6b42ae125bfdb5c7782217c83968b2e.1681767806.git.lorenzo@kernel.org (mailing list archive)
State Accepted
Delegated to: BPF
Headers show
Series [net] veth: take into account peer device for NETDEV_XDP_ACT_NDO_XMIT xdp_features flag | expand

Checks

Context Check Description
netdev/series_format success Single patches do not need cover letters
netdev/tree_selection success Clearly marked for net
netdev/fixes_present success Fixes tag present in non-next series
netdev/header_inline success No static functions without inline keyword in header files
netdev/build_32bit success Errors and warnings before: 18 this patch: 18
netdev/cc_maintainers success CCed 11 of 11 maintainers
netdev/build_clang success Errors and warnings before: 18 this patch: 18
netdev/verify_signedoff success Signed-off-by tag matches author and committer
netdev/deprecated_api success None detected
netdev/check_selftest success No net selftest shell script
netdev/verify_fixes success Fixes tag looks correct
netdev/build_allmodconfig_warn success Errors and warnings before: 18 this patch: 18
netdev/checkpatch success total: 0 errors, 0 warnings, 0 checks, 54 lines checked
netdev/kdoc success Errors and warnings before: 0 this patch: 0
netdev/source_inline success Was 0 now: 0

Commit Message

Lorenzo Bianconi April 17, 2023, 9:53 p.m. UTC 
For veth pairs, NETDEV_XDP_ACT_NDO_XMIT is supported by the current
device if the peer one is running a XDP program or if it has GRO enabled.
Fix the xdp_features flags reporting considering peer device and not
current one for NETDEV_XDP_ACT_NDO_XMIT.

Fixes: fccca038f300 ("veth: take into account device reconfiguration for xdp_features flag")
Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
---
 drivers/net/veth.c | 17 +++++++++++------
 1 file changed, 11 insertions(+), 6 deletions(-)

Comments

Alexei Starovoitov April 18, 2023, 6:19 p.m. UTC | #1 
On Mon, Apr 17, 2023 at 2:54 PM Lorenzo Bianconi <lorenzo@kernel.org> wrote:
>
> For veth pairs, NETDEV_XDP_ACT_NDO_XMIT is supported by the current
> device if the peer one is running a XDP program or if it has GRO enabled.
> Fix the xdp_features flags reporting considering peer device and not
> current one for NETDEV_XDP_ACT_NDO_XMIT.
>
> Fixes: fccca038f300 ("veth: take into account device reconfiguration for xdp_features flag")
> Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>

Applied to bpf tree.
diff mbox series

Patch

diff --git a/drivers/net/veth.c b/drivers/net/veth.c
index e1b38fbf1dd9..4b3c6647edc6 100644
--- a/drivers/net/veth.c
+++ b/drivers/net/veth.c
@@ -1262,11 +1262,12 @@  static void veth_set_xdp_features(struct net_device *dev)
 
 	peer = rtnl_dereference(priv->peer);
 	if (peer && peer->real_num_tx_queues <= dev->real_num_rx_queues) {
+		struct veth_priv *priv_peer = netdev_priv(peer);
 		xdp_features_t val = NETDEV_XDP_ACT_BASIC |
 				     NETDEV_XDP_ACT_REDIRECT |
 				     NETDEV_XDP_ACT_RX_SG;
 
-		if (priv->_xdp_prog || veth_gro_requested(dev))
+		if (priv_peer->_xdp_prog || veth_gro_requested(peer))
 			val |= NETDEV_XDP_ACT_NDO_XMIT |
 			       NETDEV_XDP_ACT_NDO_XMIT_SG;
 		xdp_set_features_flag(dev, val);
@@ -1504,19 +1505,23 @@  static int veth_set_features(struct net_device *dev,
 {
 	netdev_features_t changed = features ^ dev->features;
 	struct veth_priv *priv = netdev_priv(dev);
+	struct net_device *peer;
 	int err;
 
 	if (!(changed & NETIF_F_GRO) || !(dev->flags & IFF_UP) || priv->_xdp_prog)
 		return 0;
 
+	peer = rtnl_dereference(priv->peer);
 	if (features & NETIF_F_GRO) {
 		err = veth_napi_enable(dev);
 		if (err)
 			return err;
 
-		xdp_features_set_redirect_target(dev, true);
+		if (peer)
+			xdp_features_set_redirect_target(peer, true);
 	} else {
-		xdp_features_clear_redirect_target(dev);
+		if (peer)
+			xdp_features_clear_redirect_target(peer);
 		veth_napi_del(dev);
 	}
 	return 0;
@@ -1598,13 +1603,13 @@  static int veth_xdp_set(struct net_device *dev, struct bpf_prog *prog,
 			peer->max_mtu = max_mtu;
 		}
 
-		xdp_features_set_redirect_target(dev, true);
+		xdp_features_set_redirect_target(peer, true);
 	}
 
 	if (old_prog) {
 		if (!prog) {
-			if (!veth_gro_requested(dev))
-				xdp_features_clear_redirect_target(dev);
+			if (peer && !veth_gro_requested(dev))
+				xdp_features_clear_redirect_target(peer);
 
 			if (dev->flags & IFF_UP)
 				veth_disable_xdp(dev);